Thanks for all the kind responses to my AC issue. I have checked the center vents for both driver and passenger sides and discovered that the drive side only has hot air and the passenger side still has cold air when outside temperature is around 85-106F. Also, I noticed that the air flow has slight less volume compared to the passenger side in the center vent. Is that possible that the Freon level is OK but the internal damper of the duct for the driver side is not taking the temp. control signal from the temp. control panel on the dash board? Your kind professional suggestions are really appreciated.